Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 08/16/2012 08:38 AM, Mia Lueng wrote:
> Hi All:
> I setup a drbd device on a storage . Its write performance can reach
> to 300MB/s tested by dd. But when I setup a drbd device on it , use dd
> to test its write performance (peer node does not connect). The test
> result is only 40MB/s. drbd version is 8.3.13. And the read
> performance is also very pool(40MB/s).
>
> here is the configuration
>
>
> resource drbd0 {
> protocol A;
> on c-160 {
> device /dev/drbd0 minor 0;
> disk /dev/hadrvg/edrbd;
> address ipv4 10.62.100.160:7700;
> meta-disk internal;
> }
> on c-191 {
> device /dev/drbd0 minor 0;
> disk /dev/hadrvg/edrbd;
> address ipv4 10.62.100.191:7700;
> meta-disk internal;
> }
> net {
> ping-timeout 100;
> ping-int 100;
> data-integrity-alg crc32c;
> max-buffers 8000;
> max-epoch-size 8000;
> unplug-watermark 16;
> sndbuf-size 0;
> }
> disk {
> on-io-error pass_on;
> }
> syncer {
> rate 1000M;
> csums-alg md5;
> verify-alg md5;
> c-plan-ahead 20;
> c-fill-target 0;
> c-delay-target 30;
> }
> }
Can you provide the output of "vmstat 5" on both machines while dd is
running? 10-15 lines should be enough.
What connection do you use between the systems? According to the configured
syncer rate of 1000M that should be a 10Gbit connection?
Regards,
Dennis